migrate from gotify to ntfy with image attachment support

- Replace GotifyNotifier with NtfyNotifier for push notifications
- Add support for sending email image attachments to ntfy
- Add NTFY_URL, NTFY_TOKEN, NTFY_TOPIC environment variables
- Add get_mailpit_image() and get_mailpit_image_thumb() helpers
- Sanitize message content for HTTP headers (remove newlines)
- Remove all gotify references

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

app/main.py

@@ -24,8 +24,11 @@ load_dotenv()
 
 MAILPIT_API = os.getenv("MAILPIT_API", "http://localhost:8025")
 MAILPIT_TOKEN = os.getenv("MAILPIT_TOKEN", "")
-GOTIFY_URL = os.getenv("GOTIFY_URL","")
-GOTIFY_TOKEN = os.getenv("GOTIFY_TOKEN","")
+
+NTFY_URL = os.getenv("NTFY_URL", "")
+NTFY_TOKEN = os.getenv("NTFY_TOKEN", "")
+NTFY_TOPIC = os.getenv("NTFY_TOPIC", "")
+
 LOG_LEVEL = os.getenv("LOG_LEVEL", "INFO").upper()
 
 logging.basicConfig(
@@ -36,7 +39,7 @@ log = logging.getLogger("mailpit-hook")
 
 app = Flask(__name__)
 
-from utils.gotify_api import GotifyNotifier
+from utils.ntfy_api import NtfyNotifier
 
 # ------------------------------------------------------------------ #
 # Helpers
@@ -53,16 +56,46 @@ def get_mailpit_message(message_id: str) -> Dict[str, Any]:
     resp.raise_for_status()
     return resp.json()
 
+def get_mailpit_image_thumb(message_id: str, part_id: str) -> bytes:
+    """Retrieve image thumbnail from Mailpit REST API as binary data."""
+    url = f"{MAILPIT_API}/api/v1/message/{message_id}/part/{part_id}/thumb"
+    headers = {}
+    if MAILPIT_TOKEN:
+        headers["Authorization"] = f"Bearer {MAILPIT_TOKEN}"
 
-def send_gotify(title: str, message: str, priority: int = 5) -> None:
-    """Send a message to Gotify."""
-    notify = GotifyNotifier(GOTIFY_URL, GOTIFY_TOKEN)
-    
-    result = notify.gotify(title=title,markdown=message,priority=5)
-    if not result:
-        log.warning("Gotify push failed")
+    resp = requests.get(url, headers=headers, timeout=10)
+    resp.raise_for_status()
+    return resp.content
+
+def get_mailpit_image(message_id: str, part_id: str) -> bytes:
+    """Retrieve image thumbnail from Mailpit REST API as binary data."""
+    url = f"{MAILPIT_API}/api/v1/message/{message_id}/part/{part_id}"
+    headers = {}
+    if MAILPIT_TOKEN:
+        headers["Authorization"] = f"Bearer {MAILPIT_TOKEN}"
+
+    resp = requests.get(url, headers=headers, timeout=10)
+    resp.raise_for_status()
+    return resp.content
+
+def send_notification(title: str, message: str, priority: int = 5,
+                      image_data: bytes = None, filename: str = "image.jpg") -> bool:
+    """Send a notification to Ntfy, optionally with an image attachment."""
+    notify = NtfyNotifier(NTFY_URL, NTFY_TOKEN, NTFY_TOPIC)
+
+    if image_data:
+        result = notify.send_with_image(
+            title=title, message=message, image_data=image_data,
+            filename=filename, priority=priority
+        )
     else:
-        log.info("Gotify push OK")
+        result = notify.send(title=title, message=message, priority=priority)
+
+    if not result:
+        log.warning("Ntfy push failed")
+    else:
+        log.info("Ntfy push OK")
+    return result
 
 
 # ------------------------------------------------------------------ #
@@ -97,16 +130,35 @@ def hook():
         return jsonify({"error":"Error sending webhook"}), 500
     
 
-def handle_hook(msg_id:str):
+def handle_hook(msg_id: str):
     try:
         msg = get_mailpit_message(msg_id)
         subject = msg.get("Subject", "(no subject)")
         text = msg.get("Text", "") or msg.get("HTML", "")
+        attachments = msg.get("Attachments") or []
+
+        # Build preview text
         preview = (text or "")
         if len(preview) > 200:
             preview = preview[:200] + "..."
 
-        send_gotify(subject, preview)
+        # Check for image attachments and fetch thumbnail
+        image_data = None
+        filename = "image.jpg"
+        if attachments:
+            first_attachment = attachments[0]
+            part_id = first_attachment.get("PartID")
+            content_type = first_attachment.get("ContentType", "")
+            if part_id and content_type.startswith("image/"):
+                try:
+                    # image_data = get_mailpit_image_thumb(msg_id, part_id)
+                    image_data = get_mailpit_image(msg_id, part_id)
+                    # Extract filename from attachment if available
+                    filename = first_attachment.get("FileName", "image.jpg")
+                except Exception as e:
+                    log.warning("Failed to fetch image thumbnail: %s", e)
+
+        send_notification(subject, preview, image_data=image_data, filename=filename)
         return True
 
     except Exception as e:
@@ -119,6 +171,4 @@ def handle_hook(msg_id:str):
 # ------------------------------------------------------------------ #
 
 if __name__ == "__main__":
-    # msg_id = "ZTUUK57e7kUoaviua6TCgP@mailpit"
-    # msg = get_mailpit_message(msg_id)
     app.run(host="0.0.0.0", port=8088)